Packages with the headers-only use flag

Global definition: Install only C headers instead of whole package. Mainly used by sys-devel/crossdev for toolchain bootstrap..

dev-embedded / avr-libc : C library for Atmel AVR microcontrollers

dev-util / mingw64-runtime : Free Win64 runtime and import library definitions

sys-kernel / linux-headers : Linux system headers

sys-libs / glibc : GNU libc C library

sys-libs / musl : Light, fast and simple C library focused on standards-conformance and safety

sys-libs / newlib : Newlib is a C library intended for use on embedded systems

sys-libs / uclibc-ng : C library for developing embedded Linux systems